Build failure with recent gcc

Hello,

Version 1.9.2 fails to build with `gcc version 15.2.1 20260209 (GCC)` with following error:
```
ios_webkit_debug_proxy.c: In function ‘iwdp_get_content_type’:
ios_webkit_debug_proxy.c:1974:18: error: initialization discards ‘const’ qualifier from pointer target type [-Werror=discarded-qualifiers]
1974 | char *fext = strrchr(path, '.');
| ^~~~~~~
```